Perhaps you should try some spelling variations:
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
chi xanh » chi anh, chi danh, chi hanh
luan ban » luan van, luan san, luan han
ban cong » bang cong, van cong, phan cong
dan than » dan chan, ban than, van than
doi chi » doi khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - hanh tang luan ban cong ((dan than) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - hanh tang luan ban cong ((dan than) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh tang luan ban cong ((dan than) or (tinh toan)) cau*.